<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>Twitter</title>
		<style type="text/css">
			.heart {
				width: 100px;
				height: 100px;
				background: url("../images/heart.png") no-repeat;
				background-position: 0 0;
				cursor: pointer;
				/* animation: heart 1s steps(28); */
			}
			.heart:hover {
			  background-position: -2800px 0;
			  transition: background 1s steps(28);
			}
			@keyframes heart {
				from {
					background-position: 0 0;
				}
				to {
					background-position: -2800px 0;
				}
			}
		</style>
	</head>
	<body>
		<div class="heart"></div>
	</body>
</html>
